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Editorial Team
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Asked: 2026-05-12T20:38:37+00:00

I’m writing an application and started to test my domain model entities. If I

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I’m writing an application and started to test my domain model entities. If I Create an instance of entity Company like this var company = new Company(“my company”); I should get a valid entity, meaning the company should at this moment have an Id correct?

So the problem is that at the moment I have the Id generation made in the DB defined in an hbm file like this:

<id name="ObjectIdentity" column="CompanyId" type="System.Guid" unsaved-value="00000000-0000-0000-0000-000000000000">
  <generator class="guid.comb"/>
</id>

This causes a problem when writing unittests as I do not have en entity with an Id as it dosen’t touch the db in the test, aka I have an invalid entity.

Now should I assign Id in the application and not let nhibernate be in charge of this or is this the wrong way to do it?

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1 Answer

  1. Editorial Team

    In most cases you should be letting NHibernate do its job which is to handle persistence. This is important since it allows you to easily change things (we went from identity to hilo mid-project).

    I would question why you care that a newly created object has an id or not? From a business point of view a persistence ID is not relevant and shouldn’t be checked with via unit tests. This as mentioned is the domain of integration tests. You should be careful in how you are using an objects persistence Id throughout the rest of your application. Remember this should NOT be treated as the objects business id/key.

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